opah

from WordNet (r) 3.0 (2006)

opah
    n 1: large elliptical brightly colored deep-sea fish of Atlantic
         and Pacific and Mediterranean [syn: {opah}, {moonfish},
         {Lampris regius}]

from The Collaborative International Dictionary of English v.0.48

Opah \O"pah\, n. (Zool.)
   A large oceanic fish ({Lampris guttatus}), inhabiting the
   Atlantic Ocean. It is remarkable for its brilliant colors,
   which are red, green, and blue, with tints of purple and
   gold, covered with round silvery spots. Called also {king of
   the herrings}.
   [1913 Webster]